Electric abc lamp



(No Model.) 7 2 SheetsSheet 1.

W. K. FREEMAN.

ELECTRIC ARC LAMP.

Patented Sept. 12, 1882.

2 Sheets-Sheet 2.

(No Model.)-

W. K. FREEMAN.

ELECTRIC ARC LAMP.

No. 264,270. Patented Sept. 12, 1882.

Wm 16. 9 mm (I: I 3 l/ z UNITED STATES PATENT OETieE.

\MALTER K. FREEMAN, OF BROOKLYN, NEW YORK, ASSIGNOR TO N. F. JOBBINS, OFEAST ORANGE, NE? JERSEY.

ELECTRlC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 264,270, datedSeptember 1.2, 1882.

Application filed June 12, 1882.

To all whom it may concern Be it known that I, WALTER K. FREEMAN, acitizen of the United States, and a resident of Brooklyn, New York, haveinvented certain Improvements in Electric-Arc Lamps, of which thefollowing is a specification.

My invention consists of certain improvements in the constructionofregulating devices for the carbons of electric-arc lamps, as morefully described hereinafter.

In the accompanying drawings, Figure 1, Sheet 1, is a side View ofsufficient of the lamp to illustrate my invention; Fig. 2, an enlargedsectional plan on the line 1 2, Fig. 1; and Fig. 3, Sheet 2, aperspective view of a part of my improved regulating devices.

A is the upper cross-bar of the lamp-frame, and to the ends of this barare secured, with the usual insulation, the binding-posts d d and thevertical rods D D, carrying at their lower ends the lower-carbon holder.

On the enlarged flat portion of the crosspiece A is mounted the arch B,carrying the regulating devices, and in the top of the arch and thecenter of the cross-piece is guided the movable carbon-holder O.

E is a vertical frame, to which are loosely pivoted at c c, Fig. 3, theclampingplates K and K, and which carries at its upper and lower endsguide-rods c c, the upper rod passing through an opening in the arch,while the lower rod carries a plunger workingin a dashpot, E, on theunder side of the cross piece A. The frame E is connected by a link, Eto lugs on an armature, G, which is acted on by the poles of thedouble-wound eleetro-magnets M M, set face to face with the armaturebetween them. The armature G is carried by arms 9 g, which are pivotedat g to an extension, B, of the arch B, and on this point 9 as a centerthe armature can have a limited movement from the position shown in Fig.1 to a position opposite the centers of the poles of the electromaguets,the polar faces being curved from the same radius. The cores of themagnets M M are connected together, and are carried by a widened portionof the arch B, while the cores of the coils M M are carried by aconnecting-piece, m, which fits and is guided between flanges b b on theextension B of the (No model.)

arch B, and on the back of this connectingpiece bears a set-screw, on,by which the electro-uiagnets M M may be adjusted to bring their polarfaces nearer to or farther from the armature G.

In a notch in the upper end of the frame E fits the outer end of a fiatspring, F, which at its inner end is secured to ajaw,f, pivoted at f tothe arch B. An arm,f, on this jaw projects downward, and is acted on bya setscrew,f by which the tension of the spring may be nicely adjustedto balance the frame E and the parts carried by it.

The outer ends of the clampingplates K K rest on projections on asupporting-bar, L, which has a shank passing up through an opening inthe arch and threaded for the reception of a nut, Z, by which thesupportingpiece L may be adjusted vertically, and the clamping-plates KK consequently set to the proper angle. 1 make use of twoclampingplates, K K, set at slightly-dilfcrent angles, so that if oneclamp should not act the other will.

The electro-magnets M M and M M are double woundthat is, they are woundin one direction with thick wire in the main workingcircuit and in theopposite direction with tine wire in the shunt-circuit5 6, between thetwo binding-posts (Z d.

Supposing the current to enter at d, the main circuit is through theconductor 3,to the coils M M, to the cross-piece A, and from a branchfrom the conductor3, through the coils M M, to the cross-piece, and fromthe latter, through the conductor at, to the carbon-holder O, carbons,lower-carbon holder, rod 1), and out at d, the coils of the two pairs ofelectromagnets thus being in the two branches of aloop-circuit.

The electro-magnets are so wound with the ditterentcoils that when acurrent isfirst passed through the lamp the current in the main-circuitcoils will cause the cores to attract the armature G, raise the frame Eand clampingplates, and consequently the movable carbonholder 0, and soform the electric are. As the resistance in the main circuit increaseswith the consumption of the carbons and the current leaks through theshunt-circuit coils,

and the cores will cease to attract the armature, which will. then drop,and with it the frame E and clamping-plates K K, so as to allow thecarbons to approach again in the usual way.

I do not desire to claim in this case the combination of theclamp-carrying frame with the flat pivoted sprin gand adj ustin g-screw,as that forms the subject of a separate application.

I claim as my invention 1. The combination of the movable carbonholderof an electric-arc lamp with two sets of electro-magnets with theirpoles face to face, and having their coils Wound in opposite directionsin the main and shunt circuits, aclampcarrying frame, and an armatureconnected to the frame and having a movement between the poles of theelectro-magnets, all substantially as set forth.

2. The combination of a vertical frame, E, guided at its upper end inthe arch, and having a dash-pot atits lower end,clamping-plate carriedby and armature connected to said frame, with a movable carbon-holder,and electro-magnets having their coils wound in opposite directions inthe main and shunt circuits.

3. The combination of two sets of electromagnets in the main and shuntcircuits, and having their poles face to face, with an intermediatearmatnre carried by arms g, pivoted to the arch, amovable carbon-holder,and a clampcarrying frame.

4. The combination of the movable carbonholder and clamp-carryingt'ramewith an armature connected to said frame, two sets of electro-magnets,and devices for adjusting one set toward or from the armature,substantially as set forth.

5. The combination of the two sets of electro-magnets and intermediatearmature with a guided frame, E, carrying clamping-plates, andconnecting-link E 6. The combination of the movable carbonholdcr of anelectric lamp with two clampingplates set at different angles, andoperating devices, all substantially as set forth.

7. The combination of the movablecarbonholder, frame E, andclamping-plate with a clamp-support, L, carried by a fixed part of thelamp, and adjusting device therefor.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WALTER K. FREEMAN.

Witnesses JOHN H. KATTENSTROTH, HUBERT Howson.

